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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2291eeca203sm7317565ad.30.2025.03.27.19.48.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Mar 2025 19:48:24 -0700 (PDT) From: Amirreza Zarrabi Date: Thu, 27 Mar 2025 19:47:27 -0700 Subject: [PATCH v3 05/11] firmware: qcom: scm: add support for object invocation Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250327-qcom-tee-using-tee-ss-without-mem-obj-v3-5-7f457073282d@oss.qualcomm.com> References: <20250327-qcom-tee-using-tee-ss-without-mem-obj-v3-0-7f457073282d@oss.qualcomm.com> In-Reply-To: <20250327-qcom-tee-using-tee-ss-without-mem-obj-v3-0-7f457073282d@oss.qualcomm.com> To: Jens Wiklander , Sumit Garg , Bjorn Andersson , Konrad Dybcio , Bartosz Golaszewski , Apurupa Pattapu , Kees Cook , "Gustavo A. R. Silva" , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= Cc: linux-arm-msm@vger.kernel.org, op-tee@lists.trustedfirmware.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-doc@vger.kernel.org, Amirreza Zarrabi X-Mailer: b4 0.13.0 X-Proofpoint-GUID: HrhZ4vPkxzyYR7LbE63cseNbLnq4wCYV X-Authority-Analysis: v=2.4 cv=UblRSLSN c=1 sm=1 tr=0 ts=67e60dfb cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=Vs1iUdzkB0EA:10 a=EUspDBNiAAAA:8 a=dBYAKgxw8cyf2mnx-aAA:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-ORIG-GUID: HrhZ4vPkxzyYR7LbE63cseNbLnq4wCYV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-28_01,2025-03-27_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 phishscore=0 mlxscore=0 impostorscore=0 adultscore=0 clxscore=1015 mlxlogscore=999 bulkscore=0 malwarescore=0 spamscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503280017 Qualcomm TEE (QTEE) hosts Trusted Applications (TAs) and services in the secure world, accessed via objects. A QTEE client can invoke these objects to request services. Similarly, QTEE can request services from the nonsecure world using objects exported to the secure world. Add low-level primitives to facilitate the invocation of objects hosted in QTEE, as well as those hosted in the nonsecure world. If support for object invocation is available, the qcom_scm allocates a dedicated child platform device. The driver for this device communicates with QTEE using low-level primitives. Signed-off-by: Amirreza Zarrabi --- drivers/firmware/qcom/qcom_scm.c | 128 +++++++++++++++++++++++++++++++++ drivers/firmware/qcom/qcom_scm.h | 7 ++ include/linux/firmware/qcom/qcom_scm.h | 27 +++++++ 3 files changed, 162 insertions(+) diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index fc4d67e4c4a6..bff1b0d3306e 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -2084,6 +2084,124 @@ static int qcom_scm_qseecom_init(struct qcom_scm *scm) #endif /* CONFIG_QCOM_QSEECOM */ +#ifdef CONFIG_QCOMTEE + +/** + * qcom_scm_qtee_invoke_smc() - Invoke a QTEE object. + * @inbuf: start address of memory area used for inbound buffer. + * @inbuf_size: size of the memory area used for inbound buffer. + * @outbuf: start address of memory area used for outbound buffer. + * @outbuf_size: size of the memory area used for outbound buffer. + * @result: result of QTEE object invocation. + * @response_type: response type returned by QTEE. + * + * @response_type determines how the contents of @inbuf and @outbuf + * should be processed. + * + * Return: On success, return 0 or <0 on failure. + */ +int qcom_scm_qtee_invoke_smc(phys_addr_t inbuf, size_t inbuf_size, + phys_addr_t outbuf, size_t outbuf_size, + u64 *result, u64 *response_type) +{ + struct qcom_scm_desc desc = { + .svc = QCOM_SCM_SVC_SMCINVOKE, + .cmd = QCOM_SCM_SMCINVOKE_INVOKE, + .owner = ARM_SMCCC_OWNER_TRUSTED_OS, + .args[0] = inbuf, + .args[1] = inbuf_size, + .args[2] = outbuf, + .args[3] = outbuf_size, + .arginfo = QCOM_SCM_ARGS(4, QCOM_SCM_RW, QCOM_SCM_VAL, + QCOM_SCM_RW, QCOM_SCM_VAL), + }; + struct qcom_scm_res res; + int ret; + + ret = qcom_scm_call(__scm->dev, &desc, &res); + if (ret) + return ret; + + *response_type = res.result[0]; + *result = res.result[1]; + + return 0; +} +EXPORT_SYMBOL(qcom_scm_qtee_invoke_smc); + +/** + * qcom_scm_qtee_callback_response() - Submit response for callback request. + * @buf: start address of memory area used for outbound buffer. + * @buf_size: size of the memory area used for outbound buffer. + * @result: Result of QTEE object invocation. + * @response_type: Response type returned by QTEE. + * + * @response_type determines how the contents of @buf should be processed. + * + * Return: On success, return 0 or <0 on failure. + */ +int qcom_scm_qtee_callback_response(phys_addr_t buf, size_t buf_size, + u64 *result, u64 *response_type) +{ + struct qcom_scm_desc desc = { + .svc = QCOM_SCM_SVC_SMCINVOKE, + .cmd = QCOM_SCM_SMCINVOKE_CB_RSP, + .owner = ARM_SMCCC_OWNER_TRUSTED_OS, + .args[0] = buf, + .args[1] = buf_size, + .arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_RW, QCOM_SCM_VAL), + }; + struct qcom_scm_res res; + int ret; + + ret = qcom_scm_call(__scm->dev, &desc, &res); + if (ret) + return ret; + + *response_type = res.result[0]; + *result = res.result[1]; + + return 0; +} +EXPORT_SYMBOL(qcom_scm_qtee_callback_response); + +static void qcom_scm_qtee_free(void *data) +{ + struct platform_device *qtee_dev = data; + + platform_device_unregister(qtee_dev); +} + +static int qcom_scm_qtee_init(struct qcom_scm *scm) +{ + struct platform_device *qtee_dev; + int ret; + + /* Setup QTEE interface device. */ + qtee_dev = platform_device_alloc("qcomtee", -1); + if (!qtee_dev) + return -ENOMEM; + + qtee_dev->dev.parent = scm->dev; + + ret = platform_device_add(qtee_dev); + if (ret) { + platform_device_put(qtee_dev); + return ret; + } + + return devm_add_action_or_reset(scm->dev, qcom_scm_qtee_free, qtee_dev); +} + +#else + +static int qcom_scm_qtee_init(struct qcom_scm *scm) +{ + return 0; +} + +#endif /* CONFIG_QCOMTEE */ + /** * qcom_scm_is_available() - Checks if SCM is available */ @@ -2319,6 +2437,16 @@ static int qcom_scm_probe(struct platform_device *pdev) ret = qcom_scm_qseecom_init(scm); WARN(ret < 0, "failed to initialize qseecom: %d\n", ret); + /* + * Initialize the QTEE object interface. + * + * This only represents the availability for QTEE object invocation + * and callback support. On failure, ignore the result. Any subsystem + * depending on it may fail if it tries to access this interface. + */ + ret = qcom_scm_qtee_init(scm); + WARN(ret < 0, "failed to initialize qcomtee: %d\n", ret); + return 0; err: diff --git a/drivers/firmware/qcom/qcom_scm.h b/drivers/firmware/qcom/qcom_scm.h index 097369d38b84..a25202e99f7c 100644 --- a/drivers/firmware/qcom/qcom_scm.h +++ b/drivers/firmware/qcom/qcom_scm.h @@ -152,6 +152,13 @@ struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void); #define QCOM_SCM_SVC_GPU 0x28 #define QCOM_SCM_SVC_GPU_INIT_REGS 0x01 +/* ARM_SMCCC_OWNER_TRUSTED_OS calls */ + +#define QCOM_SCM_SVC_SMCINVOKE 0x06 +#define QCOM_SCM_SMCINVOKE_INVOKE_LEGACY 0x00 +#define QCOM_SCM_SMCINVOKE_CB_RSP 0x01 +#define QCOM_SCM_SMCINVOKE_INVOKE 0x02 + /* common error codes */ #define QCOM_SCM_V2_EBUSY -12 #define QCOM_SCM_ENOMEM -5 diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h index 983e1591bbba..bf5e64f6deba 100644 --- a/include/linux/firmware/qcom/qcom_scm.h +++ b/include/linux/firmware/qcom/qcom_scm.h @@ -176,4 +176,31 @@ static inline int qcom_scm_qseecom_app_send(u32 app_id, #endif /* CONFIG_QCOM_QSEECOM */ +#ifdef CONFIG_QCOMTEE + +int qcom_scm_qtee_invoke_smc(phys_addr_t inbuf, size_t inbuf_size, + phys_addr_t outbuf, size_t outbuf_size, + u64 *result, u64 *response_type); +int qcom_scm_qtee_callback_response(phys_addr_t buf, size_t buf_size, + u64 *result, u64 *response_type); + +#else /* CONFIG_QCOMTEE */ + +static inline int qcom_scm_qtee_invoke_smc(phys_addr_t inbuf, size_t inbuf_size, + phys_addr_t outbuf, + size_t outbuf_size, u64 *result, + u64 *response_type) +{ + return -EINVAL; +} + +static inline int qcom_scm_qtee_callback_response(phys_addr_t buf, + size_t buf_size, u64 *result, + u64 *response_type) +{ + return -EINVAL; +} + +#endif /* CONFIG_QCOMTEE */ + #endif -- 2.34.1